"Savings are based off the $300 newsstand cost."
Would the sentence still have the same meaning if "off" is replaced with "on"?
I think the sentence would be improved if you made that change.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
In what sense of 'exists'? I wonder
b
Misreading on my part of something, Bob.